This herbal contains high tonic nutritious elements. Buckwheat tea, or soba-cha, is most frequently consumed in Japan for its rich nutty roasted flavor, as well as for its nutritional value. High in B vitamins as well as antioxidants such as rutin, this tea is used as part of a weight loss plan. Contrary to popular belief, buckwheat bears no relation to wheat; it is the seed of a fruit related to rhubarb.